// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "gpu/perftests/measurements.h"

#include "base/logging.h"
#include "testing/perf/perf_test.h"
#include "ui/gl/gpu_timing.h"

namespace gpu {

Measurement::Measurement()
    : name()
    , wall_time()
    , cpu_time()
    , gpu_time()
{
}
Measurement::Measurement(const Measurement& m)
    : name(m.name)
    , wall_time(m.wall_time)
    , cpu_time(m.cpu_time)
    , gpu_time(m.gpu_time)
{
}
Measurement::Measurement(const std::string& name,
    const base::TimeDelta wall_time,
    const base::TimeDelta cpu_time,
    const base::TimeDelta gpu_time)
    : name(name)
    , wall_time(wall_time)
    , cpu_time(cpu_time)
    , gpu_time(gpu_time)
{
}

void Measurement::PrintResult(const std::string& graph) const
{
    perf_test::PrintResult(graph, "", name + "_wall", wall_time.InMillisecondsF(),
        "ms", true);
    if (cpu_time.InMicroseconds() >= 0) {
        perf_test::PrintResult(graph, "", name + "_cpu", cpu_time.InMillisecondsF(),
            "ms", true);
    }
    if (gpu_time.InMicroseconds() >= 0) {
        perf_test::PrintResult(graph, "", name + "_gpu", gpu_time.InMillisecondsF(),
            "ms", true);
    }
}

Measurement& Measurement::Increment(const Measurement& m)
{
    wall_time += m.wall_time;
    cpu_time += m.cpu_time;
    gpu_time += m.gpu_time;
    return *this;
}

Measurement Measurement::Divide(int a) const
{
    return Measurement(name, wall_time / a, cpu_time / a, gpu_time / a);
}

Measurement::~Measurement()
{
}

MeasurementTimers::MeasurementTimers(gfx::GPUTimingClient* gpu_timing_client)
    : wall_time_start_()
    , cpu_time_start_()
    , gpu_timer_()
{
    DCHECK(gpu_timing_client);
    wall_time_start_ = base::TraceTicks::Now();
    if (base::ThreadTicks::IsSupported()) {
        cpu_time_start_ = base::ThreadTicks::Now();
    } else {
        static bool logged_once = false;
        LOG_IF(WARNING, !logged_once) << "ThreadTicks not supported.";
        logged_once = true;
    }

    if (gpu_timing_client->IsAvailable()) {
        gpu_timer_ = gpu_timing_client->CreateGPUTimer(true);
        gpu_timer_->Start();
    }
}

void MeasurementTimers::Record()
{
    wall_time_ = base::TraceTicks::Now() - wall_time_start_;
    if (base::ThreadTicks::IsSupported()) {
        cpu_time_ = base::ThreadTicks::Now() - cpu_time_start_;
    }
    if (gpu_timer_.get()) {
        gpu_timer_->End();
    }
}

Measurement MeasurementTimers::GetAsMeasurement(const std::string& name)
{
    DCHECK_NE(base::TimeDelta(),
        wall_time_); // At least wall_time_ has been set.

    if (!base::ThreadTicks::IsSupported()) {
        cpu_time_ = base::TimeDelta::FromMicroseconds(-1);
    }
    int64 gpu_time = -1;
    if (gpu_timer_.get() != nullptr && gpu_timer_->IsAvailable()) {
        gpu_time = gpu_timer_->GetDeltaElapsed();
    }
    return Measurement(name, wall_time_, cpu_time_,
        base::TimeDelta::FromMicroseconds(gpu_time));
}

MeasurementTimers::~MeasurementTimers()
{
    if (gpu_timer_.get()) {
        gpu_timer_->Destroy(true);
    }
}

} // namespace gpu
